1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
|
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* egg-buffer.c - Generic data buffer, used by openssh, gnome-keyring
Copyright (C) 2007 Stefan Walter
The Gnome Keyring Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Keyring Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome Library; see the file COPYING.LIB. If not,
<http://www.gnu.org/licenses/>.
Author: Stef Walter <stef@memberwebs.com>
*/
#include "config.h"
#include <string.h>
#include <stdarg.h>
#include "egg-buffer.h"
#define DEFAULT_ALLOCATOR ((EggBufferAllocator)realloc)
int
egg_buffer_init (EggBuffer *buffer, size_t reserve)
{
return egg_buffer_init_full (buffer, reserve, NULL);
}
int
egg_buffer_init_full (EggBuffer *buffer, size_t reserve, EggBufferAllocator allocator)
{
memset (buffer, 0, sizeof (*buffer));
if (!allocator)
allocator = DEFAULT_ALLOCATOR;
if (reserve == 0)
reserve = 64;
buffer->buf = (allocator) (NULL, reserve);
if (!buffer->buf) {
buffer->failures++;
return 0;
}
buffer->len = 0;
buffer->allocated_len = reserve;
buffer->failures = 0;
buffer->allocator = allocator;
return 1;
}
void
egg_buffer_init_static (EggBuffer* buffer, const unsigned char *buf, size_t len)
{
memset (buffer, 0, sizeof (*buffer));
buffer->buf = (unsigned char*)buf;
buffer->len = len;
buffer->allocated_len = len;
buffer->failures = 0;
/* A null allocator, and the buffer can't change in size */
buffer->allocator = NULL;
}
void
egg_buffer_init_allocated (EggBuffer *buffer, unsigned char *buf, size_t len,
EggBufferAllocator allocator)
{
memset (buffer, 0, sizeof (*buffer));
if (!allocator)
allocator = DEFAULT_ALLOCATOR;
buffer->buf = buf;
buffer->len = len;
buffer->allocated_len = len;
buffer->failures = 0;
buffer->allocator = allocator;
}
void
egg_buffer_reset (EggBuffer *buffer)
{
memset (buffer->buf, 0, buffer->allocated_len);
buffer->len = 0;
buffer->failures = 0;
}
void
egg_buffer_uninit (EggBuffer *buffer)
{
if (!buffer)
return;
/*
* Free the memory block using allocator. If no allocator,
* then this memory is ownerd elsewhere and not to be freed.
*/
if (buffer->buf && buffer->allocator)
(buffer->allocator) (buffer->buf, 0);
memset (buffer, 0, sizeof (*buffer));
}
unsigned char*
egg_buffer_uninit_steal (EggBuffer *buffer, size_t *n_result)
{
unsigned char *result;
if (n_result)
*n_result = buffer->len;
result = buffer->buf;
memset (buffer, 0, sizeof (*buffer));
return result;
}
int
egg_buffer_set_allocator (EggBuffer *buffer, EggBufferAllocator allocator)
{
unsigned char *buf = NULL;
if (!allocator)
allocator = DEFAULT_ALLOCATOR;
if (buffer->allocator == allocator)
return 1;
if (buffer->allocated_len) {
/* Reallocate memory block using new allocator */
buf = (allocator) (NULL, buffer->allocated_len);
if (buf == NULL)
return 0;
/* Copy stuff into new memory */
memcpy (buf, buffer->buf, buffer->allocated_len);
}
/* If old wasn't static, then free it */
if (buffer->allocator && buffer->buf)
(buffer->allocator) (buffer->buf, 0);
buffer->buf = buf;
buffer->allocator = allocator;
return 1;
}
int
egg_buffer_equal (EggBuffer *b1, EggBuffer *b2)
{
if (b1->len != b2->len)
return 0;
return memcmp (b1->buf, b2->buf, b1->len) == 0;
}
int
egg_buffer_reserve (EggBuffer *buffer, size_t len)
{
unsigned char *newbuf;
size_t newlen;
if (len < buffer->allocated_len)
return 1;
/* Calculate a new length, minimize number of buffer allocations */
newlen = buffer->allocated_len * 2;
if (len > newlen)
newlen += len;
/* Memory owned elsewhere can't be reallocated */
if (!buffer->allocator) {
buffer->failures++;
return 0;
}
/* Reallocate built in buffer using allocator */
newbuf = (buffer->allocator) (buffer->buf, newlen);
if (!newbuf) {
buffer->failures++;
return 0;
}
buffer->buf = newbuf;
buffer->allocated_len = newlen;
return 1;
}
int
egg_buffer_resize (EggBuffer *buffer, size_t len)
{
if (!egg_buffer_reserve (buffer, len))
return 0;
buffer->len = len;
return 1;
}
unsigned char*
egg_buffer_add_empty (EggBuffer *buffer, size_t len)
{
size_t pos = buffer->len;
if (!egg_buffer_reserve (buffer, buffer->len + len))
return NULL;
buffer->len += len;
return buffer->buf + pos;
}
int
egg_buffer_append (EggBuffer *buffer, const unsigned char *val,
size_t len)
{
if (!egg_buffer_reserve (buffer, buffer->len + len))
return 0; /* failures already incremented */
memcpy (buffer->buf + buffer->len, val, len);
buffer->len += len;
return 1;
}
int
egg_buffer_add_byte (EggBuffer *buffer, unsigned char val)
{
if (!egg_buffer_reserve (buffer, buffer->len + 1))
return 0; /* failures already incremented */
buffer->buf[buffer->len] = val;
buffer->len++;
return 1;
}
int
egg_buffer_get_byte (EggBuffer *buffer, size_t offset,
size_t *next_offset, unsigned char *val)
{
unsigned char *ptr;
if (buffer->len < 1 || offset > buffer->len - 1) {
buffer->failures++;
return 0;
}
ptr = (unsigned char*)buffer->buf + offset;
if (val != NULL)
*val = *ptr;
if (next_offset != NULL)
*next_offset = offset + 1;
return 1;
}
void
egg_buffer_encode_uint16 (unsigned char* buf, uint16_t val)
{
buf[0] = (val >> 8) & 0xff;
buf[1] = (val >> 0) & 0xff;
}
uint16_t
egg_buffer_decode_uint16 (unsigned char* buf)
{
uint16_t val = buf[0] << 8 | buf[1];
return val;
}
int
egg_buffer_add_uint16 (EggBuffer *buffer, uint16_t val)
{
if (!egg_buffer_reserve (buffer, buffer->len + 2))
return 0; /* failures already incremented */
buffer->len += 2;
egg_buffer_set_uint16 (buffer, buffer->len - 2, val);
return 1;
}
int
egg_buffer_set_uint16 (EggBuffer *buffer, size_t offset, uint16_t val)
{
unsigned char *ptr;
if (buffer->len < 2 || offset > buffer->len - 2) {
buffer->failures++;
return 0;
}
ptr = (unsigned char*)buffer->buf + offset;
egg_buffer_encode_uint16 (ptr, val);
return 1;
}
int
egg_buffer_get_uint16 (EggBuffer *buffer, size_t offset,
size_t *next_offset, uint16_t *val)
{
unsigned char *ptr;
if (buffer->len < 2 || offset > buffer->len - 2) {
buffer->failures++;
return 0;
}
ptr = (unsigned char*)buffer->buf + offset;
if (val != NULL)
*val = egg_buffer_decode_uint16 (ptr);
if (next_offset != NULL)
*next_offset = offset + 2;
return 1;
}
void
egg_buffer_encode_uint32 (unsigned char* buf, uint32_t val)
{
buf[0] = (val >> 24) & 0xff;
buf[1] = (val >> 16) & 0xff;
buf[2] = (val >> 8) & 0xff;
buf[3] = (val >> 0) & 0xff;
}
uint32_t
egg_buffer_decode_uint32 (unsigned char* ptr)
{
uint32_t val = ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
return val;
}
int
egg_buffer_add_uint32 (EggBuffer *buffer, uint32_t val)
{
if (!egg_buffer_reserve (buffer, buffer->len + 4))
return 0; /* failures already incremented */
buffer->len += 4;
egg_buffer_set_uint32 (buffer, buffer->len - 4, val);
return 1;
}
int
egg_buffer_set_uint32 (EggBuffer *buffer, size_t offset, uint32_t val)
{
unsigned char *ptr;
if (buffer->len < 4 || offset > buffer->len - 4) {
buffer->failures++;
return 0;
}
ptr = (unsigned char*)buffer->buf + offset;
egg_buffer_encode_uint32 (ptr, val);
return 1;
}
int
egg_buffer_get_uint32 (EggBuffer *buffer, size_t offset, size_t *next_offset,
uint32_t *val)
{
unsigned char *ptr;
if (buffer->len < 4 || offset > buffer->len - 4) {
buffer->failures++;
return 0;
}
ptr = (unsigned char*)buffer->buf + offset;
if (val != NULL)
*val = egg_buffer_decode_uint32 (ptr);
if (next_offset != NULL)
*next_offset = offset + 4;
return 1;
}
int
egg_buffer_add_uint64 (EggBuffer *buffer, uint64_t val)
{
if (!egg_buffer_add_uint32 (buffer, ((val >> 32) & 0xffffffff)))
return 0;
return egg_buffer_add_uint32 (buffer, (val & 0xffffffff));
}
int
egg_buffer_get_uint64 (EggBuffer *buffer, size_t offset,
size_t *next_offset, uint64_t *val)
{
uint32_t a, b;
if (!egg_buffer_get_uint32 (buffer, offset, &offset, &a))
return 0;
if (!egg_buffer_get_uint32 (buffer, offset, &offset, &b))
return 0;
if (val != NULL)
*val = ((uint64_t)a) << 32 | b;
if (next_offset != NULL)
*next_offset = offset;
return 1;
}
int
egg_buffer_add_byte_array (EggBuffer *buffer, const unsigned char *val,
size_t len)
{
if (val == NULL)
return egg_buffer_add_uint32 (buffer, 0xffffffff);
if (len >= 0x7fffffff) {
buffer->failures++;
return 0;
}
if (!egg_buffer_add_uint32 (buffer, len))
return 0;
return egg_buffer_append (buffer, val, len);
}
unsigned char*
egg_buffer_add_byte_array_empty (EggBuffer *buffer, size_t vlen)
{
if (vlen >= 0x7fffffff) {
buffer->failures++;
return NULL;
}
if (!egg_buffer_add_uint32 (buffer, vlen))
return NULL;
return egg_buffer_add_empty (buffer, vlen);
}
int
egg_buffer_get_byte_array (EggBuffer *buffer, size_t offset,
size_t *next_offset, const unsigned char **val,
size_t *vlen)
{
uint32_t len;
if (!egg_buffer_get_uint32 (buffer, offset, &offset, &len))
return 0;
if (len == 0xffffffff) {
if (next_offset)
*next_offset = offset;
if (val)
*val = NULL;
if (vlen)
*vlen = 0;
return 1;
} else if (len >= 0x7fffffff) {
buffer->failures++;
return 0;
}
if (buffer->len < len || offset > buffer->len - len) {
buffer->failures++;
return 0;
}
if (val)
*val = buffer->buf + offset;
if (vlen)
*vlen = len;
if (next_offset)
*next_offset = offset + len;
return 1;
}
int
egg_buffer_add_string (EggBuffer *buffer, const char *str)
{
if (str == NULL) {
return egg_buffer_add_uint32 (buffer, 0xffffffff);
} else {
size_t len = strlen (str);
if (len >= 0x7fffffff)
return 0;
if (!egg_buffer_add_uint32 (buffer, len))
return 0;
return egg_buffer_append (buffer, (unsigned char*)str, len);
}
}
int
egg_buffer_get_string (EggBuffer *buffer, size_t offset, size_t *next_offset,
char **str_ret, EggBufferAllocator allocator)
{
uint32_t len;
if (!allocator)
allocator = buffer->allocator;
if (!allocator)
allocator = DEFAULT_ALLOCATOR;
if (!egg_buffer_get_uint32 (buffer, offset, &offset, &len)) {
return 0;
}
if (len == 0xffffffff) {
*next_offset = offset;
*str_ret = NULL;
return 1;
} else if (len >= 0x7fffffff) {
return 0;
}
if (buffer->len < len ||
offset > buffer->len - len) {
return 0;
}
/* Make sure no null characters in string */
if (memchr (buffer->buf + offset, 0, len) != NULL)
return 0;
/* The passed allocator may be for non-pageable memory */
*str_ret = (allocator) (NULL, len + 1);
if (!*str_ret)
return 0;
memcpy (*str_ret, buffer->buf + offset, len);
/* Always zero terminate */
(*str_ret)[len] = 0;
*next_offset = offset + len;
return 1;
}
int
egg_buffer_add_stringv (EggBuffer *buffer, const char** strv)
{
const char **v;
uint32_t n = 0;
if (!strv)
return 0;
/* Add the number of strings coming */
for (v = strv; *v; ++v)
++n;
if (!egg_buffer_add_uint32 (buffer, n))
return 0;
/* Add the individual strings */
for (v = strv; *v; ++v) {
if (!egg_buffer_add_string (buffer, *v))
return 0;
}
return 1;
}
int
egg_buffer_get_stringv (EggBuffer *buffer, size_t offset, size_t *next_offset,
char ***strv_ret, EggBufferAllocator allocator)
{
uint32_t n, i, j;
size_t len;
if (!allocator)
allocator = buffer->allocator;
if (!allocator)
allocator = DEFAULT_ALLOCATOR;
/* First the number of environment variable lines */
if (!egg_buffer_get_uint32 (buffer, offset, &offset, &n))
return 0;
/* Then that number of strings */
len = (n + 1) * sizeof (char*);
*strv_ret = (char**)(allocator) (NULL, len);
if (!*strv_ret)
return 0;
/* All null strings */
memset (*strv_ret, 0, len);
for (i = 0; i < n; ++i) {
if (!egg_buffer_get_string (buffer, offset, &offset,
&((*strv_ret)[i]), allocator)) {
/* Free all the strings on failure */
for (j = 0; j < i; ++j) {
if ((*strv_ret)[j])
(allocator) ((*strv_ret)[j], 0);
}
return 0;
}
}
if (next_offset != NULL)
*next_offset = offset;
return 1;
}
|